i have a 85' c.c. repowered with a 99' 225 efi merc... this has been a project just finally putting on the pieces together. first run with a 13"x21p mirage wot 5100rpm 53.5mph----4000rpm 40 mph......2nd run 13"x17 quicksilver 5800 rpm 50.5 mph----4000 33.5mph.... waiting till this weekend to try a buddies 19p wheel hope thats where i need to be